I'd like to suggest that the capes and masks that you send in are kid-friendly and kid-sized if possible.
The reason is that when companies receive mass mailings of items like this they usually donate the items to a needy charity. I'm sure CBS donated the over 3 tons of nuts (sent to them by fans to save Jericho) to a food bank. The CW also received more than 10,000 Mars bars to save Veronica Mars.
We (or at least I) don't know the culture in South Korea but I would hope that any capes and masks that are not easily ripped (such as paper) will be donated to needy and/or sick children.
In fact, being that we are supposed to have until the end of November to play, it might be nice to purchase and/or make some capes and masks for the express purpose of donating them on behalf of the City of Heroes community. I think I'll make that its own thread. =)